JP3925814B1 - Road sign pillar and manufacturing method thereof - Google Patents

Abstract

The present invention provides a road sign post having good reflection performance, excellent nighttime visibility, and capable of suppressing deterioration in nighttime visibility even when repeatedly stepped on by a vehicle, and a method for manufacturing the same.
A pole portion made of a thermoplastic polyurethane elastomer standing on the base portion, and a reflective coating layer is formed on at least a part of the outer peripheral surface of the pole; The reflective coating layer includes the spherical glass particles 24 and the highly reflective spherical particles 26, and the road sign pillar 10 is made of a non-yellowing polyurethane resin or an acrylic urethane resin as the binder 22.
[Selection] Figure 1

Description

  The present invention relates to a road sign pillar mainly installed on a road having a reflective coating layer formed on its surface and having an elastically deformable pole.

  The road sign pillar is used for marking the center separation line of the upper and lower roads, the boundary line between the roadway and the sidewalk, and markings such as park stop partitions such as parks and streets. Such road sign pillars need to be visible even at night, and therefore, a reflective tape that reflects the light of the headlight is generally wound around the top of the pole. However, since the reflective tape is narrow, night visibility is not sufficient.

  Road sign pillars that solve such problems and have a reflective coating layer formed on the entire pole are known (for example, Patent Documents 1 and 2). The reflective coating film layer disclosed in Patent Document 1 has a two-layer structure of a transparent resin layer containing glass beads on a transparent resin layer containing metal powder.

  In the invention disclosed in Patent Document 2, a pole is formed by extrusion molding, and at the same time, a translucent coating layer is formed by extrusion molding on the outer peripheral surface of the pole, and glass beads are adhered to the coating layer to thereby form a reflective coating film. It relates to road sign pillars that form layers.

JP 2000-160522 A JP 2005-90155 A

  The road sign pillar disclosed in Patent Document 1 is provided with a fixing layer for fixing glass beads after forming an undercoat layer on a pole base material as necessary and forming a transparent resin layer containing metal powder thereon. Applying and having a reflective layer formed by attaching glass beads when the fixing layer paint has a predetermined viscosity, having many manufacturing steps, complicated manufacturing, and high cost It is.

  The road sign pillar disclosed in Patent Document 2 forms a reflective layer by extruding a thermoplastic resin onto the surface of a pole that has been previously extruded and attaching glass beads immediately after the thermoplastic resin is cooled and hardened. Therefore, the adhesive strength of the glass beads is not sufficient, and when the road sign pillar is repeatedly stepped on a large truck or the like, there is a problem that the glass beads are dropped and visibility is lowered. In addition, the technique disclosed in Patent Document 2 is limited to a column-shaped road sign post that extrudes a pole, and has a large diameter on the base portion side, and the road sign post of the pole that is stable to the base is stable. There is also a problem that it cannot be applied.

  In view of the above-mentioned problems of the known technology, the present invention provides a road sign pillar that has good reflection performance, excellent nighttime visibility, and that suppresses deterioration in nighttime visibility even when repeatedly stepped on by a vehicle. It aims at providing the manufacturing method.

The road sign pillar of the present invention comprises a base part and a pole made of a thermoplastic polyurethane elastomer erected on the base part,
A reflective coating layer is formed on at least a part of the surface of the pole;
The reflective coating layer is characterized by comprising a transparent resin binder for paint containing spherical glass particles and highly reflective spherical particles coated with metal on the surface of inorganic particles .

  The road sign pillar having such a configuration has good reflection performance and excellent nighttime visibility, and when it is repeatedly stepped on by a vehicle, the nighttime visibility drops due to the drop of spherical glass particles and highly reflective spherical particles. It has been suppressed.

  In the above road sign pillar, the reflective coating layer preferably further contains milky white translucent ceramic spherical particles.

  Since the milky white translucent ceramic spherical particles have a refractive index different from that of glass particles, the reflective coating layer having the above-described structure has light having a wavelength distribution such as headlight light due to the property of light that the refractive index varies depending on the wavelength. Efficiently retroreflective and a road sign post with better nighttime visibility.

  In the above-mentioned road sign pillar, it is preferable to further have a polyurethane resin layer between the pole and the reflective coating layer.

  The road sign pillar having such a configuration suppresses a decrease in visibility at night even when the pole is crushed when passing a heavy vehicle such as a truck.

Another invention is a road sign post comprising a base part and a pole made of a thermoplastic polyurethane elastomer standing on the base part, and a reflective coating layer is formed on at least a part of the outer peripheral surface of the pole. A manufacturing method of
A pole molding process for molding a pole with a thermoplastic polyurethane elastomer, a paint containing spherical glass particles on the surface of the pole, highly reflective spherical particles coated with metal on the surface of inorganic particles , and a transparent resin binder for paint. It has the reflective paint coating process which forms the said reflective coating film layer, It is characterized by the above-mentioned.

  According to the manufacturing method of such a configuration, the nighttime visibility decreases due to the drop off of the spherical glass particles and the highly reflective spherical particles when the reflective performance is good, the nighttime visibility is excellent, and the vehicle is repeatedly stepped on by the vehicle. It is possible to manufacture road sign pillars that are suppressed.

  In the method for manufacturing a road sign pillar described above, the paint preferably further contains milky white translucent ceramic spherical particles.

  According to the manufacturing method of the road sign pillar of the above configuration, since the milky white translucent ceramic spherical particles have a refractive index different from that of the glass particles, the reflective coating layer of the above configuration has the light property that the refractive index varies depending on the wavelength. Light having a wavelength distribution such as headlight light can be retroreflected efficiently, and a road sign post with better nighttime visibility can be manufactured.

  In the above-described method for manufacturing a road sign pillar, it is preferable that the method further includes an undercoating step of forming a polyurethane resin layer on the surface of the pole before the reflective paint coating step.

  According to the manufacturing method of such a configuration, a road sign pillar in which deterioration in visibility at night is suppressed even when the pole is crushed particularly when passing a heavy vehicle such as a truck is manufactured. be able to.

  The pole of the road sign pillar of the present invention is formed of a thermoplastic polyurethane elastomer. As the thermoplastic polyurethane elastomer, it is preferable to use a polyether-based or polycarbonate-based thermoplastic polyurethane elastomer.

  The thermoplastic polyurethane elastomer preferably has a JIS-A hardness of 90 or less, and more preferably 85 or less. If the hardness is too high, damage may occur due to repeated bending. The hardness of the thermoplastic polyurethane elastomer is usually 50 or more in terms of JIS-A hardness.

  The reflective coating layer on the pole surface contains spherical glass particles, highly reflective spherical particles, and a transparent resin binder for paint. In the reflective coating layer having such a configuration, light from a headlight or the like is reflected on the surface or inner surface of the highly reflective spherical particles, and as a result, the amount of light reflected from the spherical glass particles is increased and the visibility is improved.

  A known non-yellowing resin binder can be used without limitation as a transparent resin binder for paints. Specifically, acrylic resin, non-yellowing polyurethane resin, acrylic urethane resin and the like are exemplified. Among these, non-yellowing polyurethane resin or acrylic urethane resin is preferably used because it is excellent in adhesiveness and flexibility with a pole or undercoat polyurethane resin, and does not generate cracks even if it is stepped on by a vehicle.

Examples of the glass material constituting the spherical glass particles include silicate glass, aluminoborosilicate glass, borosilicate glass and other common glasses, Na ₂ O—CaO—SiO ₂ , BaO—TiO ₂ —SiO ₂ , BaO—ZnO. Examples thereof include high refractive index glass materials such as —SiO ₂ and BaO—ZnO—TiO ₂ . Among these, the refractive index is 1.5 or more, more preferably from the viewpoint of obtaining a reflective coating layer having excellent reflection efficiency, a large difference in refractive index from the transparent resin binder for paints, and high reflectance. It is preferable to use spherical glass particles made of a high refractive index glass material of 6 or more, more preferably 1.7 or more. The particle diameter of the spherical glass particles is preferably 5 to 150 μm, more preferably 10 to 100 μm, and still more preferably 20 to 80 μm.

  Examples of highly reflective spherical particles include metal spherical particles such as aluminum spherical particles, and particles coated with metal on the surface of inorganic particles such as glass spherical particles vapor-deposited aluminum. Among these, glass spherical particles vapor-deposited aluminum Is preferable because of its low cost. In the glass spherical particles on which aluminum is vapor-deposited, aluminum may be vapor-deposited on the entire surface of the glass spherical particles, but it is also preferable that the aluminum is partially, preferably 30 to 60% of the surface. When highly reflective spherical particles with aluminum vapor deposition applied to 30-60% of the surface of spherical glass particles are added, there are particles in the reflective coating layer that have a concave surface of the metal vapor deposition surface that has a particularly high reflection efficiency. Thus, a reflective coating layer having higher reflection efficiency is formed. The particle diameter of the highly reflective spherical particles is also preferably 5 to 150 μm, more preferably 10 to 100 μm, and further preferably 20 to 80 μm. Commercially available products may be used as the highly reflective spherical particles whose surface is coated with glass spherical particles, and are commercially available from, for example, Jinan Hua Ming Pearl Material Co., Ltd. (China).

  The content ratio of the spherical glass particles and the highly reflective spherical particles in the reflective coating layer is such that (total spherical particles) / (total spherical particles + transparent resin for paint) is 40 wt% to 95 wt%, more preferably 40 to 80 wt%. % By weight. If the content of the spherical particles is too high, the strength of the reflective coating layer is lowered, and if it is too low, the reflection effect is lowered. The ratio of spherical glass particles / highly reflective spherical particles is preferably 100/1 to 0.5 / 1, more preferably 20/1 to 1/1, and 6/1 to 2/1. More preferably it is.

  In the reflective coating layer on the pole surface, the milky white translucent ceramic spherical particles that are preferably added are, for example, zirconia / silica-based particles (Zirblast; SEPR), spherical alumina (Showa Denko), spherical silica (Electrochemical Industry). Etc. are exemplified. The particle diameter of the milky white translucent ceramic spherical particles is preferably 10 to 150 μm, more preferably 20 to 100 μm.

  When milky white translucent ceramic spherical particles are contained in the reflective coating layer, it is preferable to replace some of the spherical glass particles with ceramic spherical particles. The weight ratio of spherical glass particles / ceramic spherical particles is preferably 6/1 to 1/6, more preferably 5/1 to 1/1, and 4/1 to 2/1. Further preferred.

  The polyurethane resin layer constituting material which is the undercoat layer uses a polyurethane resin excellent in flexibility and adhesiveness. It is also preferable to use a commercially available product as a constituent material of the polyurethane resin layer, and it is also preferable to use a two-component undercoat using a polyisocyanate curing agent such as Duranate N (Asahi Kasei) or Coronate L (Nippon Polyurethane). . The thickness of the polyurethane resin layer as the undercoat layer is preferably 10 to 50 μm.

  The base part of the road sign pillar of the present invention is made of a known material such as a cast type polyurethane resin or thermoplastic resin. As a thermoplastic resin, a well-known thermoplastic resin can be used without limitation. Specifically, polyester resins such as PET and PBT, polycarbonate resins, polyphenylene oxide, polyphenylene sulfide, polyurethane resins, fluorine resins such as PFA, polyolefin resins such as ABS resins and PP, and resins selected from these resins Examples thereof include blend resins and polymer alloys.

  FIG. 1 is a front view and a partially enlarged sectional view of a preferred embodiment of the road sign pillar of the present invention. The road sign post 10 is composed of a pole 12 and a base part 16, and a retroreflective tape 14 is wound around and attached to the upper part of the pole. A polyurethane resin layer (undercoat layer) 20 is laminated on the surface of the pole base layer 18 and is made of a non-yellowing polyurethane resin or an acrylic urethane resin containing spherical glass particles 24 and highly reflective spherical particles 26 thereon. A binder layer 22 is laminated to constitute a reflective coating layer. Although FIG. 1 shows an example in which spherical glass particles are used, it is also a preferable aspect to replace a part of the spherical glass particles 24 with milky white translucent ceramic spherical particles. The reflective coating layer may be formed on the entire surface of the pole 12 or may be partially formed.

Example 1
A pole was prepared using a thermoplastic polyurethane elastomer having a hardness of 70 according to JIS-A using commercially available polyoxytetramethylene glycol as a polyol component. A two-component polyurethane resin solution (seal primer: Daito Paint) using an isocyanate compound as a curing agent was applied to the pole surface and dried so that the film thickness after drying was 30 μm.

On the polyurethane resin layer, BaO—TiO ₂ —SiO ₂ spherical glass particles having an average particle diameter of 50 μm, zirconia / silica ceramic spherical particles having an average particle diameter of 60 μm, and highly reflective spherical particles having an average particle diameter of 50 μm (Polyisocyanate-curing acrylic urethane resin paint containing glass on a hemisphere of spherical glass particles) (glass spherical particles / ceramic spherical particles / highly reflective spherical particles = 2.5 / 1/1 (weight ratio) ), Titanium oxide spherical particles in solid content + content of highly reflective spherical particles = 65 wt%) was applied and dried so that the film thickness after drying was 80 μm. A road sign pillar was manufactured by mounting and fixing the base portion to the obtained pole.

(Comparative Example 1)
It evaluated as a road sign pillar, without forming a reflective coating film layer in the pole obtained in (Example 1).

(Comparative Example 2)
The coating obtained without glass spherical particles and highly reflective spherical particles was applied to the pole obtained in Example 1, and the transparent inorganic particles and highly reflective spherical particles were sprayed before the coating film was dried. A layer was formed. Since this reflective coating layer was such that the particles dropped out only by rubbing by hand, the reflective performance was not evaluated.

(Evaluation)
<Reflection performance>
The retroreflection coefficient was measured by the method shown in FIG. This measuring method is based on JIS Z 9117. The reflection performance is obtained by cutting a sample 21 cm in the vertical direction and 15 cm in the circumferential direction from the pole, irradiating white light from the position 36 away from the distance d by the projector 36, and applying the illuminance of the reflected light to the light receiver 38 at the same distance d. Measured by the following equation.
Retroreflection coefficient R = (Er × d ² ) / (Es × A)
Er is the illuminance (lux) measured by the light receiver, Es is the illuminance (lux) of the reflecting sheet surface, and A is the area (m ² ) of the sample. The measurement results are shown in Table 1.

<Durability>
The road sign pillar produced in (Example of road sign pole manufacture) is installed on the asphalt road surface, and a 20-ton truck is run at a speed of 80 km / h and trampled 10 times, then reflected by the above measurement method. Performance was measured. The measurement results are shown in Table 1.

  From the results shown in Table 1, the road sign post of the present invention did not deteriorate in visibility even after repeated stepping by heavy vehicles.

The front view and partial expanded sectional view which illustrated the suitable form of the road sign pillar of this invention The front view which showed the measuring method of the retroreflection coefficient of the road sign pillar of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Road sign pillar 12 Pole 14 Retroreflective tape 16 Base part 20 Polyurethane resin layer 22 Binder 24 Spherical glass particle 26 Highly reflective spherical particle

Claims (6)

Comprising a base and a pole made of a thermoplastic polyurethane elastomer standing on the base,
A reflective coating layer is formed on at least a part of the surface of the pole;
The road marking pillar, wherein the reflective coating layer comprises a transparent resin binder for paint containing spherical glass particles and highly reflective spherical particles metal-coated on the surface of inorganic particles .   The road sign pillar according to claim 1, wherein the reflective coating layer further contains milky white translucent ceramic spherical particles.   The road sign pillar according to claim 1 or 2, further comprising a polyurethane resin layer between the pole and the reflective coating layer. And a pole made of a thermoplastic polyurethane elastomer standing on the base portion, and a method for producing a road sign pillar in which a reflective coating layer is formed on at least a part of the outer peripheral surface of the pole. And
A pole molding process for molding a pole with a thermoplastic polyurethane elastomer, a paint containing spherical glass particles on the surface of the pole, highly reflective spherical particles coated with metal on the surface of inorganic particles , and a transparent resin binder for paint. A method for producing a road sign pillar, comprising a reflective paint coating step for forming the reflective coating layer.   The method for producing a road sign pillar according to claim 4, wherein the paint further contains milky white translucent ceramic spherical particles.   6. The method of manufacturing a road sign pillar according to claim 4, further comprising an undercoating step of forming a polyurethane resin layer on the surface of the pole before the reflective paint coating step.

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